OFFSET
0,3
COMMENTS
This is also a sequence where the digits of each integer are both horizontally and vertically symmetrical. - Philip Mizzi, May 24 2014
Numbers with no prime or semiprime digits. - Wesley Ivan Hurt, Jan 17 2016
Because the digits of each term can only be 0, 1 or 8, each number in the sequence is both mirror ambigrammatic and rotationally ambigrammatic. - Philip Mizzi, Jan 01 2021
LINKS
Bruno Berselli, Table of n, a(n) for n = 0..1000
Eric Weisstein's World of Mathematics, Smarandache Sequences.
FORMULA
G.f. G(x) satisfies G(x) = 10*(1+x+x^2)*G(x^3)+x*(1+8*x)/(1-x^3). - Robert Israel, Jan 18 2016
MAPLE
M[1]:= [0, 1, 8]:
for n from 2 to 4 do M[n]:= map(t -> (10*t, 10*t+1, 10*t+8), M[n-1]) od:
M[4]; # Robert Israel, Jan 18 2016
PROG
(Magma) [n: n in [0..2000] | forall{d: d in Intseq(n) | d in [0, 1, 8]}]; // Bruno Berselli, Jan 10 2013
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved